How is Cipher Block Chaining mode operation processed to encrypt the plain text block?
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Introduction to Block Cipher modesThere are five types of operations in block cipher modes, ECB (Electronic Code Block) mode, CBC (Cipher Block Chaining) mode, CFB (Cipher Feedback) mode, OFB (Output Feedback) mode and CTR ( Counter) mode. Where ECB and CBC mode works on block ciphers, and CFB and OFB mode works on block ciphers acting as stream ciphers. ECB is used for transmitting a single value insecure manner, CBC is used for encrypting blocks of text authentication, CFB is used for transmitting an encrypted stream of data authentication, OFB is used for transmitting an encrypted stream of data, CTR is used for transmitting block-oriented applications. Block cipher modes of operationThere are 5 modes of operation in the block cipher. 1. ECB mode
2. CBC Mode
3. CFB Mode
4. OFB mode
5. CTR Mode
Recommended ArticlesThis has been a guide to the block Cipher modes of Operation. Here we have seen modes of operation of Block Cipher with their encryption and decryption process in detail. You may also have a look at the following articles to learn more–
How do you encrypt a block cipher?The process of encrypting data is performed by XORing the plaintext with a sequence of pseudorandom values, each of which is generated from the ciphertext using a feedback function. The CTR encryption process can be visualized as a series of XORs between blocks of plaintext and corresponding blocks of ciphertext.
How does CBC mode block cipher work?2 Cipher Block Chaining Mode (CBC) In cipher block chaining mode, the plaintext of a block is combined with the ciphertext of the previous block via an exclusive or (xor) operation, and the result is encrypted. The result is the ciphertext of that block, and will also be used in the encryption of the following block.
Why mode of operation is defined explain the simplest mode for block cipher modes of operation?Electronic Code Book (ECB) –
Electronic code book is the easiest block cipher mode of functioning. It is easier because of direct encryption of each block of input plaintext and output is in form of blocks of encrypted ciphertext.
Why is using the CBC mode a good way to encrypt a long message?A major advantage of CBC mode is that, while encryption must be performed sequentially, decryption can be parallelized. The first IV is a public value and all other blocks use a ciphertext as an IV, which are public. This can make decryption faster than other block cipher modes of operation.
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